linux-kernel - Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors based on the Zen microarchitecture

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Date:   Wed, 21 Sep 2022 17:00:35 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     K Prateek Nayak <kprateek.nayak@....com>
Cc:     linux-kernel@...r.kernel.org, rafael@...nel.org, lenb@...nel.org,
        linux-acpi@...r.kernel.org, linux-pm@...r.kernel.org,
        dave.hansen@...ux.intel.com, bp@...en8.de, tglx@...utronix.de,
        andi@...as.de, puwen@...on.cn, mario.limonciello@....com,
        rui.zhang@...el.com, gpiccoli@...lia.com,
        daniel.lezcano@...aro.org, ananth.narayan@....com,
        gautham.shenoy@....com, Calvin Ong <calvin.ong@....com>,
        stable@...r.kernel.org, regressions@...ts.linux.dev
Subject: Re: [PATCH] ACPI: processor_idle: Skip dummy wait for processors
 based on the Zen microarchitecture

On Wed, Sep 21, 2022 at 12:06:38PM +0530, K Prateek Nayak wrote:
> Processors based on the Zen microarchitecture support IOPORT based deeper
> C-states. 

I've just gotta ask; why the heck are you using IO port based idle
states in 2022 ?!?! You have have MWAIT, right?